* Plugins: Change the PostgreSQL plugin to include more column types in Query Builder metaquery
Originally, the metaquery used in the PostgreSQL plugin to populate the
column dropdown menu in the Query Builder UI only included integer- and real-typed
columns. This change expands the list of acceptable types for plotting to
include numeric columns, boolean columns, and textual columns, as all are
types that could feasibly be desired to plot in a panel.
* Update types tracked in meta query builder
Removed the `boolean` and `text` types, but retained addition of `numeric` type as part of time series query builder.
Convert SQL data sources to return data frames.
Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Will Browne <will.browne@grafana.com>
Co-authored-by: Hugo Häggmark <hugo.haggmark@gmail.com>
